CN103441278A - Method for preparing carbon-coated lithium iron phosphate through microwave pyrolysis of ionic liquid - Google Patents

Method for preparing carbon-coated lithium iron phosphate through microwave pyrolysis of ionic liquid Download PDF

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CN103441278A
CN103441278A CN2013104142172A CN201310414217A CN103441278A CN 103441278 A CN103441278 A CN 103441278A CN 2013104142172 A CN2013104142172 A CN 2013104142172A CN 201310414217 A CN201310414217 A CN 201310414217A CN 103441278 A CN103441278 A CN 103441278A
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carbon
ionic liquid
lithium
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methylimidazole
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朱福良
蒙延双
王达健
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Lanzhou University of Technology
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Lanzhou University of Technology
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention provides a method for preparing carbon-coated lithium iron phosphate through microwave pyrolysis of ionic liquid. The method comprises the following steps of: ball-milling an iron source, a lithium source, a phosphorus source, ionic liquid and a doping ion compound at a high speed to form uniformly mixed slurry; drying the slurry to obtain a lithium iron phosphate precursor; calcining the precursor in a microwave oven under the protection of inert gases to obtain carbon-coated lithium iron phosphate powder. The method has the beneficial effects that the lithium iron phosphate precursor is heated by utilizing the wave absorbing characteristics of the iron source and the ionic liquid and meanwhile lithium iron phosphate is coated with carbon by utilizing a pyrolysis product of the ionic liquid in the microwave field; 0.5C rate discharge specific capacity of prepared carbon-coated lithium iron phosphate reaches 145mAh/g.

Description

The method of the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system
Technical field
The present invention relates to the preparation method of anode material for lithium-ion batteries.
Background technology
LiFePO4 is the earliest by propositions such as Goodenough, and it has 170mAh/g theoretical capacity and 3.5V discharge voltage, but its conduction rate variance.LiFePO4 had been carried out to the electric conductivity that a large amount of study on the modification improves LiFePO4 both at home and abroad in recent years, mainly comprised the modes such as control granular size and pattern, carbon coating, metal ion mixing.In order to realize the industrialization of lithium iron phosphate positive material, carbon coated and doped metal ion be the main direction of LiFePO4 modification.
At present, the preparation method of LiFePO 4 powder mainly contains solid phase method, carbothermic method, sol-gal process, hydro thermal method and microwave method etc.Microwave method has that synthesis temperature is low, generated time is short and the advantage such as energy consumption is low.Chinese patent (CN1775666A, CN1821064A, CN1907844A, CN1911792A, CN1948133A, CN1986396A, CN101179124A, CN101279725A, CN101555004A, CN101699639A, CN101759172A, CN101764205A, CN101807692A, CN101817515A, CN101826616A, CN102104144A, CN102275890A, CN102347477A, CN102381692A, CN102544494A, CN102800863A, CN102842716A etc.) in, disclosed microwave method prepares the technique of carbon-coated LiFePO 4 for lithium ion batteries material all with glucose, sucrose, starch, citric acid, acetylene black, the organic substances such as polyvinyl alcohol carry out the LiFePO4 material with carbon-coated surface as carbon source.Often need to destroy polymer chain in these traditional carbon source carbonisations and decompose and produce H 2o, CO 2deng gas and little molecular organic compound, cause the inner defects such as crack, pore that form of carbon film.Ionic liquid has extremely low vapour pressure, and most of ionic liquids are (400-1000 ℃) generating gasification not in wider temperature range, but when temperature acquires a certain degree direct carbonization.Document J. Mater. Chem, 2012,22 (11): in 4611-4614, the author adopts the two fluoroform sulfimide salt (EMIm-TFSI) of ionic liquid 1-ethyl-3-methyl-imidazoles as carbon source, after Pintsch process at electrode material LiFePO 4particle surface has formed the compound carbon film of nitrating of the even compact that about 15nm is thick, and he thinks that the nitrating carbon film of this even compact has obviously reduced the polarization of electrode interior, so its high rate performance and cycle performance carry out the LiFePO of carbon coating as carbon source than glucose 4material all is significantly improved.
Summary of the invention
the purpose of this invention is to provide a kind ofthe method of the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system.
the present invention isthe method of the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system, the steps include:
(1) according to stoichiometric proportion Li xfe ypO 4: M z, wherein M is the doping ion, x=0.8-1.2, and y=0.8-1.2, z=0.01-0.1, take source of iron, ,Lin source, lithium source, carbon source and doping metals compound, and the carbon source addition is Li xfe ypO 4: M zmass ratio 5-50%;
(2) above-mentioned material is added in decentralized medium, carry out the high speed ball milling, time remaining 2-10h, form the mixed slurry of solid content 30-60%, and slurry is dry under room temperature ~ 300 ℃, obtains presoma;
(3) presoma is put into to crucible, be warming up to 500～900 ℃ in the microwave oven of inert atmosphere protection, naturally cooling after insulation 10-40 min, obtain the LiFePO 4 powder that carbon coats.
The present invention utilizes the microwave absorbing property of source of iron and ionic liquid to be heated ferric lithium phosphate precursor, utilizes the pyrolysis product of ionic liquid under microwave field to carry out the carbon coating to LiFePO4 simultaneously.The carbon-coated LiFePO 4 for lithium ion batteries 0.5C multiplying power discharging specific capacity of preparation reaches 145mAh/g.The technique that the present invention adopts is simple, is applicable to suitability for industrialized production.
The accompanying drawing explanation
The process chart that Fig. 1 is the synthetic carbon-coated LiFePO 4 for lithium ion batteries of the present invention, the scanning electron microscope (SEM) photograph that Fig. 2 is the synthetic carbon-coated LiFePO 4 for lithium ion batteries powder of the present invention, the specific discharge capacity curve chart that Fig. 3 is the synthetic carbon-coated LiFePO 4 for lithium ion batteries of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
As shown in Figure 1, the method for the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system, the steps include:
(1) according to stoichiometric proportion Li xfe ypO 4: M z, wherein M is the doping ion, x=0.8-1.2, and y=0.8-1.2, z=0.01-0.1, take source of iron, ,Lin source, lithium source, carbon source and doping metals compound, and the carbon source addition is Li xfe ypO 4: M zmass ratio 5-50%;
(2) above-mentioned material is added in decentralized medium, carry out the high speed ball milling, time remaining 2-10h, form the mixed slurry of solid content 30-60%, and slurry is dry under room temperature ~ 300 ℃, obtains presoma;
(3) presoma is put into to crucible, be warming up to 500～900 ℃ in the microwave oven of inert atmosphere protection, naturally cooling after insulation 10-40 min, obtain the LiFePO 4 powder that carbon coats.
According to above-described method, described source of iron is superfine iron powder specifically, or FeOOH FeOOH, or iron hydroxide Fe (OH) 3, or di-iron trioxide Fe 2o 3,, or ferric phosphate FePO 4, or ferrous oxalate FeC 2o 4or the combination of the above source of iron material.
According to above-described method, described lithium source is lithium carbonate Li specifically 2cO 3, or lithium hydroxide LiOH, or lithium oxalate Li 2c 2o 4, or lithium citrate C 6h 5li 3o 7.4H 2o, or lithium dihydrogen phosphate LiH 2pO 4, or the combination of the above lithium source substance.
According to above-described method, described phosphorus source is diammonium hydrogen phosphate (NH specifically 4) 2hPO 4, or ammonium dihydrogen phosphate NH 4h 2pO 4, or lithium dihydrogen phosphate LiH 2pO 4, or phosphoric acid H 3pO 4in, or the combination of the above phosphorus source material.
According to above-described method, described doping metals compound is magnesium nitrate Mg (NO 3) 2.2H 2o, or magnesium oxalate MgC 2o 4.2H 2o, or nitric acid nickel (NO 3) 26H 2o, or nickel acetate C 2h 3niO 2, or cobalt nitrate Co (NO 3) 26H 2o, or cobalt acetate C 4h 6o 4co4H 2o, or aluminum nitrate [Al (NO 3) 39H 2o], or the combination of the above doping metals compound.
According to above-described method, described decentralized medium is deionized water, or absolute ethyl alcohol, or acetone, or carrene, or the combination of the above decentralized medium.
According to above-described method, described carbon source is ionic liquid 1-ethyl-3-methylimidazole nitrate [EMIm] NO specifically 3, or 1-dodecyl-3-methylimidazole nitrate [C 12mIm] NO 3, or 1-nitrile propyl group-3-methylimidazole nitrate [CPMIm] NO 3, or 1-pi-allyl-3 methylimidazole nitrate [AMIm] NO 3, or 1-ethyl-3-methylimidazole dintrile amine salt [EMIm] N (CN) 2, or N-ethylpyridine dintrile amine salt [Epy] DCA, or N-butyl-pyridinium nitrate [Bpy] NO 3 , or1-methyl imidazolium tetrafluoroborate [MIm] BF 4, or 1-ethyl-3-methylimidazole tetrafluoroborate [EMIm] BF 4, or N-butyl-pyridinium tetrafluoroborate [Bpy] BF 4, or 1-methylimidazole dihydric phosphate [MIm] H 2pO 4, or 1-ethyl-3-methylimidazole dihydric phosphate [EMIm] H 2pO 4, or N-butyl-pyridinium hexafluorophosphate [Bpy] PF 6, or the combination of the above carbon source.
Embodiment 1:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 15.08g ferric phosphate (FePO 4), 3.62g lithium carbonate (Li 2cO 3), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole nitrate.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally cooling; obtain the LiFePO 4 powder that carbon coats, granule-morphology as shown in Figure 2.
The battery performance test of gained lithium iron phosphate positive material all adopts the CR2025 button cell, in being full of the glove box of inert atmosphere, is assembled.Negative pole adopts metal lithium sheet, and electrolyte adopts 1mol.L -liPF 6/ EC:DMC (1:1), wherein EC is ethylene carbonate, DMC is dimethyl carbonate.Positive plate preparation technology is as follows: by positive electrode and conductive agent acetylene black, the binding agent PVDF(polyvinylidene fluoride prepared) by 85:8:7, mix, add appropriate NMP(N-methyl pyrrolidone) in agate mortar, grind evenly, form the colloidal mixture of thickness, then be uniformly coated on the aluminium foil that 0.02mm is thick, be placed in 120 ℃ of vacuumize 20h, the battery assembled carries out charge-discharge performance and cycle performance test with blue electric battery test system.As shown in Figure 3, charge-discharge magnification is under the 0.5C condition, and material initial discharge specific capacity is 146.6mAh/g, through 50 circulation volume conservation rates 98.6%.
Embodiment 2:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 15.08g ferric phosphate (FePO 4), 3.62g lithium carbonate (Li 2cO 3), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole dintrile amine salt [EMIm] N (CN) 2.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 145.0mAh/g, through 50 circulation volume conservation rates 100%.
Embodiment 3:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 15.08g ferric phosphate (FePO 4), 3.62g lithium carbonate (Li 2cO 3), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole tetrafluoroborate [EMIm] BF 4.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 142.3mAh/g, through 50 circulation volume conservation rates 98.6%.
Embodiment 4:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 15.08g ferric phosphate (FePO 4), 3.62g lithium carbonate (Li 2cO 3), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole dihydric phosphate [EMIm] H 2pO 4.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 139.7mAh/g, through 50 circulation volume conservation rates 99.2%.
Embodiment 5:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 7.99g di-iron trioxide (Fe 2o 3), 10.19g lithium dihydrogen phosphate (LiH 2pO 4), 0.23g ammonium dihydrogen phosphate (NH 4h 2pO 4), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole nitrate.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 140.4mAh/g, through 50 circulation volume conservation rates 99.8%.
Embodiment 6:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 7.99g di-iron trioxide (Fe 2o 3), 10.19g lithium dihydrogen phosphate (LiH 2pO 4), 0.23g ammonium dihydrogen phosphate (NH 4h 2pO 4), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole dintrile amine salt [EMIm] N (CN) 2.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 143.3mAh/g, through 50 circulation volume conservation rates 97.4%.
Embodiment 7:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 7.99g di-iron trioxide (Fe 2o 3), 10.19g lithium dihydrogen phosphate (LiH 2pO 4), 0.23g ammonium dihydrogen phosphate (NH 4h 2pO 4), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole tetrafluoroborate [EMIm] BF 4.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
According to the method assembled battery of embodiment 1, to be tested, charge-discharge magnification is under the 0.5C condition, the material initial discharge capacity reaches 139.4mAh/g, through 50 circulation volume conservation rates 95.7%.
Embodiment 8:
According to stoichiometric proportion Li 0.98mg 0.02fePO 4at first take 7.99g di-iron trioxide (Fe 2o 3), 10.19g lithium dihydrogen phosphate (LiH 2pO 4), 0.23g ammonium dihydrogen phosphate (NH 4h 2pO 4), 0.297g magnesium oxalate (MgC 2o 4.2H 2o) and 3.16g1-ethyl-3-methylimidazole dihydric phosphate [EMIm] H 2pO 4.These materials are added to absolute ethyl alcohol; 600 rpm high speed ball milling 6h form the mixed slurry of solid content 50%; slurry drying under 60 ℃ obtains presoma; presoma is put into crucible and is warming up to 600 ℃ at the microwave oven of inert atmosphere protection; be incubated after 20 min naturally coolingly, obtain the LiFePO 4 powder that carbon coats.
Method assembled battery according to embodiment 1 is tested, and charge-discharge magnification is under the 0.5C condition, and material initial discharge capacity 137.6mAh/g, through 50 circulation volume conservation rates 96.2%.

Claims (8)

1. the method for the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system, the steps include:
(1) according to stoichiometric proportion Li xfe ypO 4: M z, wherein M is the doping ion, x=0.8-1.2, and y=0.8-1.2, z=0.01-0.1, take source of iron, ,Lin source, lithium source, carbon source and doping metals compound, and the carbon source addition is Li xfe ypO 4: M zmass ratio 5-50%;
(2) above-mentioned material is added in decentralized medium, carry out the high speed ball milling, time remaining 2-10h, form the mixed slurry of solid content 30-60%, and slurry is dry under room temperature ~ 300 ℃, obtains presoma;
(3) presoma is put into to crucible, be warming up to 500～900 ℃ in the microwave oven of inert atmosphere protection, naturally cooling after insulation 10-40 min, obtain the LiFePO 4 powder that carbon coats.
2. microwave cracking ionic liquid legal system, for the method for carbon-coated LiFePO 4 for lithium ion batteries, is characterized in that specifically superfine iron powder of described source of iron according to claim 1, or FeOOH FeOOH, or iron hydroxide Fe (OH) 3, or di-iron trioxide Fe 2o 3,, or ferric phosphate FePO 4, or ferrous oxalate FeC 2o 4or the combination of the above source of iron material.
3. microwave cracking ionic liquid legal system, for the method for carbon-coated LiFePO 4 for lithium ion batteries, is characterized in that specifically lithium carbonate Li of described lithium source according to claim 1 2cO 3, or lithium hydroxide LiOH, or lithium oxalate Li 2c 2o 4, or lithium citrate C 6h 5li 3o 7.4H 2o, or lithium dihydrogen phosphate LiH 2pO 4, or the combination of the above lithium source substance.
4. microwave cracking ionic liquid legal system, for the method for carbon-coated LiFePO 4 for lithium ion batteries, is characterized in that specifically diammonium hydrogen phosphate (NH of described phosphorus source according to claim 1 4) 2hPO 4, or ammonium dihydrogen phosphate NH 4h 2pO 4, or lithium dihydrogen phosphate LiH 2pO 4, or phosphoric acid H 3pO 4in, or the combination of the above phosphorus source material.
5. microwave cracking ionic liquid legal system, for the method for carbon-coated LiFePO 4 for lithium ion batteries, is characterized in that described doping metals compound is magnesium nitrate Mg (NO according to claim 1 3) 2.2H 2o, or magnesium oxalate MgC 2o 4.2H 2o, or nitric acid nickel (NO 3) 26H 2o, or nickel acetate C 2h 3niO 2, or cobalt nitrate Co (NO 3) 26H 2o, or cobalt acetate C 4h 6o 4co4H 2o, or aluminum nitrate [Al (NO 3) 39H 2o], or the combination of the above doping metals compound.
6. the method for the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system according to claim 1, it is characterized in that described decentralized medium is deionized water, or absolute ethyl alcohol, or acetone, or carrene, or the combination of the above decentralized medium.
7. microwave cracking ionic liquid legal system, for the method for carbon-coated LiFePO 4 for lithium ion batteries, is characterized in that specifically ionic liquid 1-ethyl-3-methylimidazole nitrate [EMIm] NO of described carbon source according to claim 1 3, or 1-dodecyl-3-methylimidazole nitrate [C 12mIm] NO 3, or 1-nitrile propyl group-3-methylimidazole nitrate [CPMIm] NO 3, or 1-pi-allyl-3 methylimidazole nitrate [AMIm] NO 3, or 1-ethyl-3-methylimidazole dintrile amine salt [EMIm] N (CN) 2, or N-ethylpyridine dintrile amine salt [Epy] DCA, or N-butyl-pyridinium nitrate [Bpy] NO 3 , or1-methyl imidazolium tetrafluoroborate [MIm] BF 4, or 1-ethyl-3-methylimidazole tetrafluoroborate [EMIm] BF 4, or N-butyl-pyridinium tetrafluoroborate [Bpy] BF 4, or 1-methylimidazole dihydric phosphate [MIm] H 2pO 4, or 1-ethyl-3-methylimidazole dihydric phosphate [EMIm] H 2pO 4, or N-butyl-pyridinium hexafluorophosphate [Bpy] PF 6, or the combination of the above carbon source.
8. the method for the standby carbon-coated LiFePO 4 for lithium ion batteries of microwave cracking ionic liquid legal system according to claim 1, is characterized in that described slurry drying is a kind of in baking oven or spray drying.
CN2013104142172A 2013-09-12 2013-09-12 Method for preparing carbon-coated lithium iron phosphate through microwave pyrolysis of ionic liquid Pending CN103441278A (en)

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Cited By (6)

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CN107093716A (en) * 2017-04-15 2017-08-25 三峡大学 A kind of preparation method of ion liquid modified high-performance vanadium phosphate sodium/carbon composite anode material
CN111655625A (en) * 2017-11-17 2020-09-11 昂泰克系统公司 Solid state synthesis method for metal mixed oxides and surface modification of these materials and use of these materials in batteries, especially as positive electrode materials
CN112331846A (en) * 2019-08-27 2021-02-05 万向一二三股份公司 Preparation method of high-rate positive electrode material lithium iron phosphate
CN112573851A (en) * 2020-12-27 2021-03-30 中南大学 Method for recovering sandstone aggregate from waste concrete
CN114335480A (en) * 2021-12-31 2022-04-12 欣旺达电动汽车电池有限公司 Core-shell carbon-coated doped lithium iron phosphate, and preparation method and application thereof
CN114715870A (en) * 2022-03-30 2022-07-08 合肥国轩高科动力能源有限公司 Porous carbon layer coated lithium iron phosphate material and preparation method and application thereof

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107093716A (en) * 2017-04-15 2017-08-25 三峡大学 A kind of preparation method of ion liquid modified high-performance vanadium phosphate sodium/carbon composite anode material
CN111655625A (en) * 2017-11-17 2020-09-11 昂泰克系统公司 Solid state synthesis method for metal mixed oxides and surface modification of these materials and use of these materials in batteries, especially as positive electrode materials
CN112331846A (en) * 2019-08-27 2021-02-05 万向一二三股份公司 Preparation method of high-rate positive electrode material lithium iron phosphate
CN112573851A (en) * 2020-12-27 2021-03-30 中南大学 Method for recovering sandstone aggregate from waste concrete
CN114335480A (en) * 2021-12-31 2022-04-12 欣旺达电动汽车电池有限公司 Core-shell carbon-coated doped lithium iron phosphate, and preparation method and application thereof
CN114335480B (en) * 2021-12-31 2023-07-14 欣旺达电动汽车电池有限公司 Core-shell carbon-coated doped lithium iron phosphate, and preparation method and application thereof
CN114715870A (en) * 2022-03-30 2022-07-08 合肥国轩高科动力能源有限公司 Porous carbon layer coated lithium iron phosphate material and preparation method and application thereof
CN114715870B (en) * 2022-03-30 2023-12-08 合肥国轩高科动力能源有限公司 Porous carbon layer coated lithium iron phosphate material and preparation method and application thereof

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Application publication date: 20131211